Modibodi Basic Mid-Rise Period Brief
A water-repellent or grease-resistant treatment of unstated chemistry, with a brand PFAS statement we have not verified.
Modibodi says it does not intentionally use PFAS in its period underwear. We record that as an unverified brand claim. Mamavation reported no fluorine detected in Modibodi period underwear. Its record describes a water-repellent or grease-resistant treatment of unstated chemistry, which is still counted.
Brand says: “Modibodi says it does not intentionally use PFAS in its period underwear.”
We flunk more products than we pass. This one earned its grade. How we grade
Material
organic cotton blend with water-resistant coating
Brand disclosure
Brand claims PFAS-free
Lab data
No PFAS found in testing
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What Modibodi Basic Mid-Rise Period Brief is made of, ingredients and materials
This brief combines organic cotton with a water-resistant coating of undisclosed chemistry. Organic cotton eliminates synthetic pesticide residues present in conventional cotton. The coating's formulation is not publicly detailed by Modibodi, which is the main transparency gap for this product. Cotton-based period wear avoids the microplastic risk of fully synthetic alternatives and generally shows lower off-gassing than polyester-heavy designs.
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Water-resistant coating composition (unspecified chemistry)
Modibodi does not publicly name the coating chemistry beyond claiming PFAS-free status. Without third-party test confirmation or material disclosure, the specific water-repellent coating (water-repellent coating) used remains unknown; it could be polyurethane, fluorine-free acrylate, or proprietary polymer.
Azo dyes (synthetic colorants)
The brief is available in multiple colors. Modibodi has not disclosed dye chemistry or compliance with restricted azo dye limits. Organic cotton does not automatically guarantee azo-free dyes; certification or testing would be required to verify.
Microplastics
Any water-resistant polymer coating, if not durably bonded, may shed particles during repeated washing. No data on Modibodi brief shedding rates is public. Cotton substrate mitigates microplastic risk compared to synthetic-fiber alternatives, but coating wear should be monitored.
Source, EPA ↗Allergic contact dermatitis to coating or dyes
Period underwear sits against sensitive skin for extended periods. No brand-specific dermatological adverse-event reports are documented, but unspecified coating chemistry and potential azo dyes create a low but unquantified sensitization risk in individuals with contact allergies.
What’s reassuring
Brand-stated PFAS-free
The brand states this product is PFAS-free. We have not verified the claim.
No PFAS found in lab test
No PFAS detected in independent testing.
Formaldehyde / VOCs
Organic cotton base reduces residual pesticides but does not guarantee absence of formaldehyde-releasing resins in dyeing or finishing. No public record of testing or detected formaldehyde in Modibodi products, but lack of certification (OEKO-TEX) leaves this unconfirmed.
Source, ATSDR ↗How is this PFAS grade calculated?
The brand's record and disclosure
Modibodi markets itself as PFAS-free, but the company has not published third-party test results or named the specific water-repellent chemistry used. The brand has no documented recalls or safety controversies in the public record. Their disclosure is marketing-forward rather than detailed; they do not appear to have published material safety data or independent certification (e.g., OEKO-TEX or Global Organic Textile Standard) for this product line.
How it compares in its category
Period underwear typically uses polyurethane, polyester microfiber, or proprietary coatings for absorbency and waterproofing. Modibodi's organic cotton base is a midrange choice, less synthetic than full-polyester competitors, but the unverified coating chemistry puts it in a less transparent position than brands using named (and tested) water-repellent coating finishes. Competitors offering OEKO-TEX certification or named fluorine-free chemistries (e.g., wax-based or silicone finishes) provide stronger assurance.
If you buy it
Wash in warm or cool water (not hot) to avoid degrading the water-resistant coating. Do not dry-clean or expose to high heat. Replace the brief when absorbency visibly decreases or the coating shows wear (usually 1-2 years with regular washing). Avoid fabric softeners and bleach, which can compromise the water-resistant finish. If you experience skin irritation, discontinue use and rinse thoroughly; coating sensitivity is rare but possible.
What is not known about PFAS in this product?
- Basis
- Model estimate, 85% confidence, not a lab result
- Lab test
- Independent test found none
- Brand statement
- Modibodi has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Modibodi Basic Mid-Rise Period Brief?
- organic cotton, waterproof backing layer
- A third party reports verifying it as PFAS-free
- Coating degradation and microparticle shedding
2 hazards checked on this product, all on its full breakdown.
- organic cotton blend, water-resistant gusset
- The brand calls it PFAS-free, which we have not verified
- Microplastic shedding from water-resistant barrier
- Organic cotton, wood pulp fiber
- The brand calls it PFAS-free, which we have not verified
- Azo dyes and synthetic dyes
2 hazards checked on this product, all on its full breakdown.
More period underwear grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.